Brake-shoe.



R.. I. STOKES.

BRAKE SHOE.

APPLICATION FILED DEC. 30, |914.

Patented Dec. 21, 1915.

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shoe,

yconsists of UNITED STATESv FATEN'I OFFICE.

' ROBERT J. STOKES, OF TRENTON, NEW JERSEY.

BRAKE-SHOE.

To all whom it may concern.' Be it known that I, ROBERT J. S'roKEs, a citizen of the United States, and a resident of Trenton, county of Mercer, State of New have invented certain Improvements in Brake-Shoes, of which the following is a specification.

One object of my invention is to improve the construction of brake shoes and the lining therefor.

A further object of the invention is to design the shoe so that the lining can be forced into the shoe underrpressure and re.- tained in place.

A still further object of the invention is to arrange the layers of lining material prior to being pressed into the shoe so as to avoid uneven or raw edges.

These objects I attain "in the following manner, reference being had to the accompanying drawings in which: Figure 1 is a perspective view of a'ibrake showing the lining .in position; Fig. 2 is a side view of the same; Fig. 3 is a vertical sectional view; Fig.- -Lis a perspective View of the shoe prior to inserting the v1inin'g; Fig. 5 is a sectional view, showing the method of arranging the layers of lining' material prior to being forced into position; and Fig. 6 is a perspective view of one of the lstrips of material which is used in carrying out my invention.

Referring to the drawings, 1 is the brake shoev having a recess 2 with undercut flanges 3 at each side and also having a series of barbs 4, which are also undercut, and which the surface of the shoe, as shown in Fig. 4. At each side of the shoe are flanges 5 which retain the material 'laterally. The material, :is-illustrated in-Fig. 6, a series of sets of woven asbestos fiber, as at 6, wires 7 longitudinally arrangedv therein and this material i's impregnated with a rubber composition, or its equivalent, which ties the fibers firmly together and provides a suitable surface for thebrake lining. I'lay no claim to this composition as it may be modified considerably without departing from the essential features of the invention. In

.cut -edges and the undercut prongs. there will be no free ends of the liber exsubjected.

having a series of metallic.

' Specification of Letters Patent. Patentd Dec, 21, 1915. Application led December 30, 1914. ASerial No. 879,673.

which are likely to be frayed out as -the fabric is continued around each end.

A suitable die is providedof a shape to conform to the finished outer surface of the lining, theshape beingbclearly shown in Fig. l. The lining is su jected to about two thousand pounds pressure to the inch, which will causethe laminated lining material to be forced into the cavity 2 of the brake, as

illustrated in Fig. 3, and While under pressureit is vulcanizedby steam in the ordinary manner until it is thoroughly set, after which theA pressure is removed and the result is a lining accuratel)7 fitting' they cavity of the shoe and held in the cavity by the underposed, the surface Will wear away evenly and will provide a lining which will be able to withstand the hard usage to which it is `While I have shown the lining as applied to a shoe. or head of a particular shape, it -will be understood that the shoe or head may be modified according to the use to `which theinvention is to be applied.

I claim: 1. The combination of a brake shoe having an undercut cavity and a lining consisting of asbestos fiber combined with metallic Wires and impregnated with a cenientitious material, the material being forced into the undercut cavity and-shaped under pressure,

,the bearing-surface of the lining extending beyond the shoe.

2. A brakeshoe having a cavity and undercut projections; a lining consisting of a series of woven laminated sections formed of asbestos and reinforcing wires and held together by a ceinentitious material. said laminated sectionslbeiiig forced into the cavity of the shoe and shaped under pressure. v

'3. The combination of a shoe having a recess with undercut projections: a fibrous lining consisting of a series of layers of woven fabric. the layers being turned iii at each end witlrthe abutting edges on the inside and pressed into the 'cavity and sliped to conform "to the lines thereof.

4. A brake shoe having a recess with unl decut ends and a series of undercut 1progectlons; a fibrous hnmg 'conslstlng of a seriesof-ayers of asbestos renforeedwth L Wire and ladhesive lnmteirlal, the said layers oeing bent inward with 4the raw edges abu't` -tingso as to provide continuous unbroken ibersuat eehV end when the iiUng/is pfressed linto the .properv shape and vulcanized.

Intestimony whereof have signed my Aname to this specification :in the presence of 

